S500-400-R Equivalent & Substitute Parts

Part Overview

The Eaton S500-400-R is a 400 mA, 250 V AC/DC fast-blow glass fuse cartridge in a 5mm x 20mm package format. This component requires a compatible fuse holder for installation and is designed for circuit protection applications requiring fast response characteristics. The part is active in production status with full international compliance certifications including BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE approval. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and regulatory compliance to enable direct component selection for replacement or design flexibility.

Substiute Parts

S500-400-R

Eaton - Electronics DivisionIn Stock: 772S500-400-R Datasheet

Current PartRFQ

BK/S500-400-R

Eaton - Electronics DivisionIn Stock: 1136BK/S500-400-R Datasheet

Parametric EquivalentRFQ

BK1/S500-400-R

Eaton - Electronics DivisionIn Stock: 1533BK1/S500-400-R Datasheet

Parametric EquivalentRFQ

0217.400MXP

Littelfuse Inc.In Stock: 16670217.400MXP Datasheet

DirectRFQ

0034.1512

SCHURTER Inc.In Stock: 19800034.1512 Datasheet

Parametric EquivalentRFQ

0217.400HXP

Littelfuse Inc.In Stock: 20070217.400HXP Datasheet

Parametric EquivalentRFQ

0217.400TXP

Littelfuse Inc.In Stock: 8860217.400TXP Datasheet

Parametric EquivalentRFQ

0617.400MXP

Littelfuse Inc.In Stock: 12930617.400MXP Datasheet

Parametric EquivalentRFQ

FSD-400MA

OptiFuseIn Stock: 4896FSD-400MA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the S500-400-R is determined by the following critical parameters:

Electrical Equivalence Requirements:

• Current Rating: 400 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 35A (exact match required)

Mechanical Compatibility Requirements:

• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Requires Holder (exact match required)

Regulatory Compliance:

• RoHS3 Compliant status (all substitutes must meet this requirement)
• Approval agencies may vary by manufacturer while maintaining functional equivalence

All substitute parts listed below meet these critical parameters and are therefore direct functional equivalents suitable for replacement in applications originally specified for the S500-400-R.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are functionally equivalent to the S500-400-R based on matching electrical ratings, mechanical dimensions, and response characteristics. Selection among these alternatives is based on the following factors:

Manufacturer Variants (Eaton S500 Series): The BK/S500-400-R and BK1/S500-400-R are Eaton-manufactured variants within the same S500 series. These parts maintain identical electrical and mechanical specifications to the primary S500-400-R designation and are suitable for direct substitution where Eaton brand continuity is required.

Cross-Manufacturer Alternatives: The Littelfuse 217 series (0217.400MXP, 0217.400HXP, 0217.400TXP), SCHURTER FSF 5x20 series (0034.1512), Littelfuse 617 series (0617.400MXP), and OptiFuse FSD series (FSD-400MA) all meet the critical electrical and mechanical parameters. These parts carry active product status and ROHS3 compliance. Selection among cross-manufacturer options is determined by supply chain requirements, certification preferences, or design specifications that reference specific manufacturer part numbers.

Regulatory Compliance: All substitute parts maintain ROHS3 compliance and carry appropriate international certifications (CCC, CE, CSA, cULus, UL, VDE, SEMKO, or equivalent). Specific certification requirements for end applications should be verified against the approval agency list for each candidate part.

Product Availability: All listed parts maintain active production status with documented inventory levels, ensuring supply chain continuity for both immediate replacement and future procurement needs.

Frequently Asked Questions (FAQ)

Q: Can I substitute the S500-400-R with any of the listed parts?

A: Yes. All listed parts meet the critical substitution parameters: 400 mA current rating, 250 V AC voltage rating, fast-blow response time, 5mm x 20mm package dimensions, 35A breaking capacity, and ROHS3 compliance. Mechanical compatibility with existing fuse holders is guaranteed by identical package specifications.

Q: What is the difference between the Eaton S500 variants (S500-400-R, BK/S500-400-R, BK1/S500-400-R)?

A: These are manufacturer designations within the Eaton S500 series. All three parts share identical electrical ratings, mechanical dimensions, and performance characteristics. The variant designations reflect internal Eaton product line organization and do not affect functional equivalence or interchangeability.

Q: Are there differences in melting I²t values among the substitute parts?

A: Yes. Melting I²t values vary slightly across manufacturers: Eaton S500 series (0.18), Littelfuse 217 and 617 series (0.125), SCHURTER FSF 5x20 (0.085), and OptiFuse FSD (0.1224). These variations reflect different thermal characteristics within the fast-blow response classification. All parts maintain the same 400 mA current rating and 250 V voltage rating. Melting I²t differences do not affect basic substitution eligibility but may influence performance in specific circuit protection applications with particular thermal requirements.

Q: What mounting considerations apply to all these fuse cartridges?

A: All listed parts are cartridge-type fuses requiring a compatible fuse holder for installation. The 5mm x 20mm package dimension is standardized across all substitutes, ensuring mechanical compatibility with holders designed for this format. Verify that the existing fuse holder is rated for 250 V AC and 400 mA operation.

Q: Which certifications are most important for my application?

A: Certification requirements depend on end-use application and regional regulations. The S500-400-R carries BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE approvals. Cross-manufacturer alternatives carry overlapping certifications including CCC, CE, CSA, cULus, UL, VDE, and SEMKO. Verify that the selected substitute part carries certifications required by your application standards and regional compliance requirements.

Q: Can I use these fuses in both AC and DC circuits?

A: All listed parts are rated for 250 V AC/DC operation. The 250 V AC rating applies to alternating current circuits. DC applications are supported at the same voltage rating. Verify that your specific circuit application falls within the rated voltage and current parameters.

Q: What is the operating temperature range for these fuses?

A: The S500-400-R does not specify an operating temperature range in the provided data. Cross-manufacturer alternatives (Littelfuse, SCHURTER, OptiFuse) specify -55°C to 125°C operating temperature ranges. Verify temperature requirements for your specific application environment.